<!DOCTYPE html>
<html lang="en">

<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <meta http-equiv="X-UA-Compatible" content="ie=edge">
    <title>Document</title>
</head>

<body>

    <input type="text" id="sxm">

    <script>
        
        // var str = "name";
        var obj = {
            [str]: "zcm",
            [1 + 1] : "num"
        }
        // console.log(obj[2]);

    
    </script>
</body>

</html>